重命名现有的边关系? [英] Renaming existing edge relationships?

问题描述

是否有一种简单的方法可以更新所有现有边缘关系的名称?

Is there a simple way to update the name of all of a type of existing edge relationships?

alter class EDGE_NAME name NEW_EDGE_NAME

更新基边类的名称，但不影响任何现有关系.

updates the name of the base edge class, but doesn't affect any existing relationships.

即:

create class Person extends V
create class Car extends V
create class OWNS extends E

create vertex Person set name="Bob"
create vertex Car set name="Jeep"

create edge OWNS from (select from Person where name="Bob") to (select from Car where name="Jeep")
alter class OWNS name DRIVES

除了删除旧的边类型并创建一个新的边类型之外什么都不做，不影响现有的关系(Bob 仍然拥有一辆吉普车，但 OWNS 不存在)

does nothing but delete the old edge type and create a new edge type, leaving the existing relationship unaffected (Bob still OWNS a Jeep, yet OWNS doesn't exist)

如果存在数以千计的这种关系，我们应该怎么做?

What are we supposed to do if thousands of these relationships exist?

推荐答案

您应该使用以下命令重命名属性，这些命令将复制到新名称并删除之前的输入和输出方向的名称:

You should rename attributes with the following commands that copy to the new name and drop the previous ones for both in and out directions:

UPDATE V SET out_DRIVES = out_OWNS where out_OWNS is not null
UPDATE V SET in_DRIVES = in_OWNS where in_OWNS is not null
UPDATE V REMOVE out_OWNS where out_OWNS is not null
UPDATE V REMOVE in_OWNS where in_OWNS is not null

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